CN103023611A - Moonlet-based wireless communication method and system - Google Patents
Moonlet-based wireless communication method and system Download PDFInfo
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Abstract
The invention discloses a moonlet-based wireless communication method and system. The method comprises the following steps of: emitting a control channel and a data channel by a first satellite through a control character and a data character of a radio frame, wherein the control character bears the control channel, and the data character bears the data channel; calculating frame timing by a second satellite according to a received synchronization character, wherein the radio frame provides the synchronization character; acquiring the positions of a reference character and a control character according to the frame timing, and receiving control information in the control channel; and receiving data information in the data channel according to the frame timing and the control information. According to the method disclosed by the embodiment of the invention, the velocity can be very high by virtue of an orthogonal frequency division multiplexing manner, and the complexity can be very low, therefore, the method and the system are suitable for communication between moonlets at present; data transmission among the moonlets is achieved by coordination and treatment of the reference character of the wireless frame and the control character and the data character; and meanwhile, the moonlet-based wireless communication method has flexibility and redundancy rate, and the risk of task failure can be reduced.
Description
Technical field
The present invention relates to the satellite communication field, particularly a kind of wireless communications method and system based on moonlet.
Background technology
Along with the development satellite of communication and computer technology gradually to small but excellent future development.The formation flight of moonlet is in fact to utilize a plurality of aloft moonlets to form definite shape, between each moonlet by between star communication connect each other, collaborative work, the tasks such as the collection of shared spacing wave and processing and carrying payload, a whole group of stars consists of one and satisfies the virtual-sensor task needs, larger or detector.
At present communication general employing code division multiple access or optical communication between the moonlet, code division multiple access mode implementation complexity is not high, but general speed is very low, more and more can not satisfy present two-forty requirement; Although and optical communication mode can reach very high speed, cost compare is high, realizes complicated.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency.The present invention adopts the OFDM mode, can reach very high speed, and implementation complexity is very low, is fit to very much communicate by letter between the present moonlet.
For achieving the above object, the embodiment of one aspect of the present invention proposes a kind of wireless communications method based on moonlet, may further comprise the steps: S1: the control character of the first passing of satelline radio frames and data symbol send control channel and data channel, wherein, Bearer Control channel in the described control character carries data channel in the described data symbol; S2: the second satellite calculates frame regularly according to the synchronizing symbol that receives, and wherein, described radio frames provides described synchronizing symbol; S3: regularly obtain the position of reference symbol and control character according to described frame, and receive the control information in the described control channel; And S4: according to described frame regularly and described control information receive data message in the described data channel.
Method according to the embodiment of the invention, by adopting the OFDM mode, can reach very high speed, and implementation complexity is very low, be fit to very much communicate by letter between the present moonlet, and to the cooperating and process the transfer of data that realizes between the moonlet of the reference symbol of radio frames and control character and data symbol, have simultaneously flexibility and redundancy, can reduce the risk of mission failure.
In one embodiment of the present of invention, described step S1 specifically comprises: S11: the control character of the first passing of satelline radio frames sends control channel; And S12: the data symbol of the first passing of satelline radio frames sends data channel.
In one embodiment of the present of invention, described step S11 further comprises: S111: described control information is added cyclic redundancy check (CRC) and carried out channel convolutional coding obtaining the first control data; S112: described the first control data are carried out rate-matched obtain the second control data; S113: described the second control data are carried out albefaction process and modulate the acquisition modulation symbol; And S114: described modulation symbol is mapped on the subcarrier of described control character, and the frequency domain data of described mapping is carried out sending to described the second satellite behind the Fast Fourier Transform Inverse.
In one embodiment of the present of invention, described step S12 further comprises: S121: described data message is added cyclic redundancy check (CRC) obtain the first data; S122: described the first data sectional is become a plurality of encoding blocks; S123: each encoding block to described a plurality of encoding blocks adds cyclic redundancy check (CRC) and carries out Turbo coding acquisition the second data; S124: described the second data are spliced into a string data, and it is carried out rate-matched obtain the 3rd data; S125: described the 3rd data are carried out albefaction process and modulate the acquisition modulation symbol; And S126: described modulation symbol is mapped on the subcarrier of described data symbol, and the frequency domain data of described mapping is carried out sending to described the second satellite behind the Fast Fourier Transform Inverse.
In one embodiment of the present of invention, described step S2 specifically comprises: S21: the antenna data that receives is carried out down-conversion, analog-to-digital conversion, obtain digital baseband signal; And S22: it is relevant to slide with the local synchronizing sequence of storing and described digital baseband signal, and calculates described frame regularly.
In one embodiment of the present of invention, described step S3 specifically comprises: S31: receive data is done the fast Fourier transform conversion on the border of received reference symbol and control character, obtains frequency domain data; S32: in the frequency domain data of described reference symbol and control character, extract respectively reference symbol subcarrier and control channel subcarrier; S33: carry out channel estimating with described reference symbol subcarrier and obtain channel evaluation data; S34: carry out channel equalization reconciliation constellation mapping acquisition soft bit information according to described channel evaluation data and described control channel subcarrier; S35: described soft bit information is carried out data length data before scramble process and rate de-matching obtain rate-matched; And S36: the data length data before the described rate-matched are carried out Viterbi decoding and cyclic redundancy check (CRC), if cyclic redundancy check (CRC) by receive the control channel success.
In one embodiment of the present of invention, described step S4 specifically comprises: S41: receive data is done the fast Fourier transform conversion on the border of received reference symbol and data symbol, obtains frequency domain data; S42: in the frequency domain data of described reference symbol and data symbol, extract respectively reference symbol subcarrier and data channel subcarrier; S43: described reference symbol subcarrier is carried out channel estimating obtain channel evaluation data; S44: carry out channel equalization reconciliation constellation mapping acquisition soft bit information according to described channel evaluation data and described data channel subcarrier; S45: described soft bit information is carried out data length data before scramble process and rate de-matching obtain data rate; S46: described data length data are cut apart obtain a plurality of encoding blocks; S47: each encoding block to described a plurality of encoding blocks carries out Turbo decoding and cyclic redundancy check (CRC); And S48: then will describedly remove cyclic redundancy check data when cyclic redundancy check (CRC) success and be spliced into a string data and carry out again cyclic redundancy check (CRC), if verification by described the second satellite reception data successfully.
For achieving the above object, embodiments of the invention propose a kind of wireless communication system based on moonlet on the other hand, comprise: sending module, the control character and the data symbol that are used for the first passing of satelline radio frames send control channel and data channel, wherein, Bearer Control channel in the described control character carries data channel in the described data symbol; The synchronizing signal receiver module is used for the second satellite and calculates frame regularly according to the synchronizing symbol that receives, and wherein, described radio frames provides described synchronizing symbol; The control signal receiver module is used for regularly obtaining according to described frame the position of reference symbol and control character, and receives the control information in the control channel; And the data-signal receiver module, be used for according to described frame regularly and described control information receive the data message of described data channel.
System according to the embodiment of the invention, by adopting the OFDM mode, can reach very high speed, and implementation complexity is very low, be fit to very much communicate by letter between the present moonlet, and to the cooperating and process the transfer of data that realizes between the moonlet of the reference symbol of radio frames and control character and data symbol, have simultaneously flexibility and redundancy, can reduce the risk of mission failure.
In one embodiment of the present of invention, described sending module specifically comprises: control channel sends submodule, and the control character that is used for the first passing of satelline radio frames sends control channel; And data channel transmission submodule, the data symbol that is used for the first passing of satelline radio frames sends data channel.
In one embodiment of the present of invention, described control channel sends submodule and further comprises: the first check code unit is used for described control information is added cyclic redundancy check (CRC) and carried out channel convolutional coding acquisition the first control data; The rate-matched unit is used for that described the first control data are carried out rate-matched and obtains the second control data; The first albefaction modulating unit is used for that described the second control data are carried out albefaction and processes and modulate the acquisition modulation symbol; And the first mapping transformation unit, be used for described modulation symbol is mapped to the subcarrier of described control character, and the frequency domain data of described mapping is carried out sending to described the second satellite behind the Fast Fourier Transform Inverse.
In one embodiment of the present of invention, described data channel sends submodule and further comprises: the second check code unit is used for that described data message is added cyclic redundancy check (CRC) and obtains the first data; Segmenting unit is used for described the first data sectional is become a plurality of encoding blocks; The 3rd check code unit is used for each encoding block of described a plurality of encoding blocks is added cyclic redundancy check (CRC) and carries out Turbo coding acquisition the second data; The splicing matching unit is used for described the second data are spliced into a string data, and it is carried out rate-matched obtains the 3rd data; The second albefaction modulating unit is used for that described the 3rd data are carried out albefaction and processes and modulate the acquisition modulation symbol; And the second mapping transformation unit, be used for described modulation symbol is mapped to the subcarrier of described data symbol, and the frequency domain data of described mapping is carried out sending to described the second satellite behind the Fast Fourier Transform Inverse.
In one embodiment of the present of invention, described synchronizing signal receiver module specifically comprises: the frequency conversion converting unit, be used for the antenna data that receives is carried out down-conversion, analog-to-digital conversion, and obtain digital baseband signal; And computing unit, it is relevant to be used for sliding with the local synchronizing sequence of storing and described digital baseband signal, and calculates described frame regularly.
In one embodiment of the present of invention, described control signal receiver module specifically comprises: the first converter unit, be used for doing the fast Fourier transform conversion at the border of received reference symbol and control character receive data, and obtain frequency domain data; The first extraction unit is used for extracting respectively reference symbol subcarrier and control channel subcarrier at the frequency domain data of described reference symbol and control character; The first channel estimating unit is used for that described reference symbol subcarrier is carried out channel estimating and obtains channel evaluation data; The first Well-Balanced Mapping unit is used for carrying out channel equalization reconciliation constellation mapping acquisition soft bit information according to described channel evaluation data and described control channel subcarrier; The first rate de-matching unit is for the data length data of described soft bit information being carried out before scramble process and rate de-matching obtain rate-matched; And the coupling verification unit, be used for the data length data before the described rate-matched are carried out Viterbi decoding and cyclic redundancy check (CRC), if cyclic redundancy check (CRC) by receive the control channel success.
In one embodiment of the present of invention, described data-signal receiver module specifically comprises: the second converter unit, be used for doing the fast Fourier transform conversion at the border of received reference symbol and data symbol receive data, and obtain frequency domain data; The second extraction unit is used for extracting respectively reference symbol subcarrier and data channel subcarrier at the frequency domain data of described reference symbol and data symbol; The second channel estimation unit is used for that described reference symbol subcarrier is carried out channel estimating and obtains channel evaluation data; The second Well-Balanced Mapping unit is used for carrying out channel equalization reconciliation constellation mapping acquisition soft bit information according to described channel evaluation data and described data channel subcarrier; The second rate de-matching unit is for the data length data of described soft bit information being carried out before scramble process and rate de-matching obtain data rate; Cutting unit obtains a plurality of encoding blocks for described data length data are cut apart; The decoding verification unit is used for each encoding block of described a plurality of encoding blocks is carried out Turbo decoding and cyclic redundancy check (CRC); And the splicing verification unit, be used for then will describedly removing cyclic redundancy check data when the cyclic redundancy check (CRC) success and be spliced into a string data and carry out again cyclic redundancy check (CRC), if verification by described the second satellite reception data are successful.
The aspect that the present invention adds and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is according to an embodiment of the invention based on the flow chart of the wireless communications method of moonlet;
Fig. 2 is according to an embodiment of the invention based on the frame diagram of the wireless communication system of moonlet;
Fig. 3 is that control channel sends the frame diagram of submodule according to an embodiment of the invention;
Fig. 4 is that data channel sends the frame diagram of submodule according to an embodiment of the invention;
Fig. 5 is the frame diagram of control channel receiver module according to an embodiment of the invention; And
Fig. 6 is that data channel receives the frame diagram of submodule according to an embodiment of the invention.
Embodiment
The below describes embodiments of the invention in detail, and the example of embodiment is shown in the drawings, and wherein identical or similar label represents identical or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
Fig. 1 is the flow chart based on the wireless communications method of moonlet of the embodiment of the invention.As shown in Figure 1, the wireless communications method based on moonlet according to the embodiment of the invention may further comprise the steps:
Step S101, the control character of the first passing of satelline radio frames and data symbol send control channel and data channel, and wherein, Bearer Control channel in the control character carries data channel in the data symbol.
In one embodiment of the invention, a radio frames length is 1ms on the time domain, and comprising Tu of 30720 Tu(is (1/30720) ms), be divided into 15 symbols.The 1st symbol is synchronizing symbol, comprises that 256 Tu are used for processing synchronously.2nd, 6,10,14 symbols are reference symbol, are used for doing channel estimating.The 3rd symbol is control character, is used for bear control information.All the other symbols are data symbol, are used for carrying user data.Wherein, symbol is used for sending the synchronizing sequence of 256 default length synchronously, directly sends in time domain, and all the other symbols are OFDM symbol, need mapping (enum) data on the present frequency domain, then forwards on the time domain to send.Carrying the PN code reference sequences of 4 1200 length in the reference symbol, be mapped to respectively on 1200 subcarriers of 4 reference symbols.On frequency domain, subcarrier spacing is 15KHz, and 1200 subcarriers take the 20M bandwidth altogether.The length of OFDM symbol is 2176 Tu, and wherein, cyclic prefix portion is divided into 128 Tu, and data division is 2048 Tu.
The process of transmitting of control information is as follows: at first, for control information is added 24 cyclic redundancy check (CRC) and is carried out channel convolutional coding acquisition the first control data, wherein, control information comprises source network address, source device address, destination network addresses, destination device address, data message length, data message modulation system etc., and this data message modulation system can be Quadrature Phase Shift Keying, 16 quadrature amplitude modulation or 64 quadrature amplitude modulation.Then, the first control data are carried out channel convolutional coding and rate-matched acquisition the second control data, wherein, control channel adopts Quadrature Phase Shift Keying, the data that can carry 1200*2=2400 bit.The second control data are carried out that albefaction is processed and modulation obtains modulation symbol, wherein, albefaction is processed the pseudo noise sequence that data and one is predetermined and is carried out XOR again.At last, modulation symbol is mapped on 1200 subcarriers of control character, and the frequency domain data of mapping is carried out sending to the second satellite behind the Fast Fourier Transform Inverse.
The process of transmitting of data message is as follows: at first, the cyclic redundancy check (CRC) of data message being added 24 obtains the first data.Then, the first data sectional is become N encoding block, wherein,
The length of a front N-1 encoding block is
The length of N encoding block is
Each encoding block is wherein added 24 cyclic redundancy check (CRC), and carry out the Turbo coding and obtain the second data.Again the second data are spliced into a string data, and it is carried out rate-matched obtain the 3rd data, wherein, the data volume that can carry is 1200*9*Q
mIndividual bit.Wherein, the bit number of each modulation symbol carrying is Q
m, during the Quadrature Phase Shift Keying modulation, Q
m=2; During the modulation of 16 quadrature amplitude modulation, Q
m=4; During the modulation of 64 quadrature amplitude modulation, Q
m=6.Afterwards, the 3rd data are carried out albefaction is processed and modulation obtains modulation symbol, wherein, albefaction is treated to the pseudo noise sequence that data and one is predetermined and carries out XOR.At last, modulation symbol is mapped on 1200*9 the subcarrier of data symbol, and the frequency domain data of mapping is carried out sending to the second satellite behind the Fast Fourier Transform Inverse.
Step S102, the second satellite calculates frame regularly according to the synchronizing symbol that receives, and wherein, radio frames provides synchronizing symbol.
Particularly, the synchronizing signal of the antenna data that receives is carried out down-conversion, analog-to-digital conversion, obtain digital baseband signal, and it is relevant to slide in the synchronizing sequence of the second satellite storage, judge synchronously whether success.If synchronously success is also calculated frame regularly.
Step S103 regularly obtains the position of reference symbol and control character according to frame, and receives the control information in the control channel.
Particularly, at first do fast Fourier transform according to the position of reference symbol and control character at the border of received reference symbol and control character receive data, obtain frequency domain data, and in the frequency domain data of reference symbol and control character, extract respectively reference symbol subcarrier and control channel subcarrier.Then, carry out channel estimating with the reference symbol subcarrier and obtain channel evaluation data.Afterwards, carry out channel equalization reconciliation constellation mapping acquisition soft bit information according to channel evaluation data and control channel subcarrier.Again soft bit information is carried out data length data before scramble process and rate de-matching obtain rate-matched, wherein, scramble process multiplies each other soft bit and pseudo noise sequence.At last, the data length data before the rate-matched are carried out Viterbi decoding and cyclic redundancy check (CRC), if cyclic redundancy check (CRC) by receive the control channel success.
Step S104 is according to the data message in frame timing and the control information receive data channel.
Particularly, at first do the fast Fourier transform conversion at the border of received reference symbol and data symbol receive data, obtain frequency domain data, and in the frequency domain data of reference symbol and data symbol, extract respectively reference symbol subcarrier and data channel subcarrier.Then, the reference symbol subcarrier is carried out channel estimating and obtain channel evaluation data.Afterwards, carry out channel equalization according to channel evaluation data and data channel subcarrier and conciliate constellation mapping and obtain soft bit information, and soft bit information is carried out data length data before scramble process and rate de-matching obtain data rate.Again the data length data is cut apart and obtained a plurality of encoding blocks.At last, each encoding block of a plurality of encoding blocks carried out Turbo decoding and cyclic redundancy check (CRC).Then will remove cyclic redundancy check data when cyclic redundancy check (CRC) success and be spliced into a string data and carry out again cyclic redundancy check (CRC), if verification by the success of the second satellite reception data.
Method according to the embodiment of the invention, by adopting the OFDM mode, can reach very high speed, and implementation complexity is very low, be fit to very much communicate by letter between the present moonlet, and to the cooperating and process the transfer of data that realizes between the moonlet of the reference symbol of radio frames and control character and data symbol, have simultaneously flexibility and redundancy, can reduce the risk of mission failure.
Fig. 2 is according to an embodiment of the invention based on the frame diagram of the wireless communication system of moonlet.As shown in Figure 2, the wireless communication system based on moonlet according to the embodiment of the invention comprises sending module 100, synchronizing signal receiver module 200, control signal receiver module 300 and data-signal receiver module 400.
Particularly, control character and data symbol that sending module 100 is used for the first passing of satelline radio frames send control channel and data channel, and wherein, Bearer Control channel in the control character carries data channel in the data symbol.
In an embodiment of the present invention, sending module 100 comprises that control channel sends submodule 110 and data channel sends submodule 120.
The control character that control channel transmission submodule 110 is used for the first passing of satelline radio frames sends control channel.
Fig. 3 is that control channel sends the frame diagram of submodule according to an embodiment of the invention.As shown in Figure 3, control channel transmission submodule comprises the first check code unit 111, rate-matched unit 112, the first albefaction modulating unit 113 and the first mapping transformation unit 114.
The first check code unit 111 is used for control information is added cyclic redundancy check (CRC) and carried out channel convolutional coding acquisition the first control data.Wherein, control information comprises source network address, source device address, destination network addresses, destination device address, data message length, data message modulation system etc.
Rate-matched unit 112 is used for that the first control data are carried out rate-matched and obtains the second control data.Control channel adopts Quadrature Phase Shift Keying, the data that can carry 1200*2=2400 bit
The first albefaction modulating unit 113 is used for that the second control data are carried out albefaction and processes and modulate the acquisition modulation symbol.
The first mapping transformation unit 114 is used for modulation symbol is mapped to the subcarrier of control character, and the frequency domain data of mapping is carried out sending to the second satellite behind the Fast Fourier Transform Inverse.
The data symbol that data channel transmission submodule 120 is used for the first passing of satelline radio frames sends data channel.
Fig. 4 is that data channel sends the frame diagram of submodule according to an embodiment of the invention.As shown in Figure 4, data channel transmission submodule 120 comprises the second check code unit 121, segmenting unit 122, the 3rd check code unit 123, splicing matching unit 124, the second albefaction modulating unit 125 and the second mapping transformation unit 126.
The second check code unit 121 is used for that data message is added cyclic redundancy check (CRC) and obtains the first data.
Segmenting unit 122 is used for the first data sectional is become N encoding block, wherein,
The length of a front N-1 encoding block is
The length of N encoding block is
The 3rd check code unit 123 is used for each encoding block of a plurality of encoding blocks is added cyclic redundancy check (CRC) and carries out Turbo coding acquisition the second data.
Splicing matching unit 124 is used for the second data are spliced into a string data, and it is carried out rate-matched obtains the 3rd data, and wherein, the data volume that can carry is 1200*9*Q
mIndividual bit.
The second albefaction modulating unit 125 is used for that the 3rd data are carried out albefaction and processes and modulate the acquisition modulation symbol.
The second mapping transformation unit 126 is used for modulation symbol is mapped to 1200*9 subcarrier of data symbol, and the frequency domain data of mapping is carried out sending to the second satellite behind the Fast Fourier Transform Inverse.
Synchronizing signal receiver module 200 is used for the second satellite and calculates frame regularly according to the synchronizing symbol that receives, and wherein, radio frames provides synchronizing symbol.
In an embodiment of the present invention, synchronizing signal receiver module 200 comprises frequency conversion converting unit and computing unit.
The frequency conversion converting unit is used for the antenna data that receives is carried out down-conversion, analog-to-digital conversion, obtains digital baseband signal.
Computing unit be used for the synchronizing sequence of local storage with digital baseband signal slide relevantly, and calculate the frame timing.
Control signal receiver module 300 is used for regularly obtaining according to frame the control signal of the position reception control channel of control character.
Fig. 5 is that control channel receives the frame diagram of submodule according to an embodiment of the invention.As shown in Figure 5, control signal receiver module 300 comprises the first converter unit 310, the first extraction unit 320, the first channel estimating unit 330, the first Well-Balanced Mapping unit 340, the first rate de-matching unit 350 and coupling verification unit 360.
The first converter unit 310 is used for doing fast Fourier transform at the border of received reference symbol and control character receive data, obtains frequency domain data;
The first extraction unit 320 is used for extracting respectively reference symbol subcarrier and control channel subcarrier at the frequency domain data of reference symbol and control character.
The first channel estimating unit 330 is used for that the reference symbol subcarrier is carried out channel estimating and obtains channel evaluation data;
The first Well-Balanced Mapping unit 340 is used for carrying out channel equalization reconciliation constellation mapping acquisition soft bit information according to channel evaluation data and control channel subcarrier.
The first rate de-matching unit 350 is for the data length data of soft bit information being carried out before scramble process and rate de-matching obtain rate-matched.Wherein, scramble process multiplies each other soft bit and pseudo noise sequence.
Coupling verification unit 360 is used for the data length data before the rate-matched are carried out Viterbi decoding and cyclic redundancy check (CRC), if cyclic redundancy check (CRC) by receive the control channel success.
The data message that data-signal receiver module 400 is used for according to timing information and control information receive data channel.
Fig. 6 is that data channel receives the frame diagram of submodule according to an embodiment of the invention.As shown in Figure 6, data-signal receiver module 400 comprises the second converter unit 410, the second extraction unit 420, second channel estimation unit 430, the second Well-Balanced Mapping unit 440, the second rate de-matching unit 450, cutting unit 460, decoding verification unit 470 and splicing verification unit 480.
The second converter unit 410 is used for doing the fast Fourier transform conversion at the border of received reference symbol and data symbol receive data, obtains frequency domain data.
The second extraction unit 420 is used for extracting respectively reference symbol subcarrier and data channel subcarrier at the frequency domain data of reference symbol and data symbol.
Second channel estimation unit 430 is used for that the reference symbol subcarrier is carried out channel estimating and obtains channel evaluation data.
The second Well-Balanced Mapping unit 440 is used for carrying out channel equalization reconciliation constellation mapping acquisition soft bit information according to channel evaluation data and data channel subcarrier.
The second rate de-matching unit 450 is for the data length data of soft bit information being carried out before scramble process and rate de-matching obtain data rate.
Cutting unit 460 obtains a plurality of encoding blocks for the data length data is cut apart.
Decoding verification unit 470 is used for each encoding block of a plurality of encoding blocks is carried out Turbo decoding and cyclic redundancy check (CRC).
Splicing verification unit 480 is used for then will removing cyclic redundancy check data when the cyclic redundancy check (CRC) success and is spliced into a string data and carries out cyclic redundancy check (CRC) again, if verification by the success of the second satellite reception data.
System according to the embodiment of the invention, by adopting the OFDM mode, can reach very high speed, and implementation complexity is very low, be fit to very much communicate by letter between the present moonlet, and to the cooperating and process the transfer of data that realizes between the moonlet of the reference symbol of radio frames and control character and data symbol, have simultaneously flexibility and redundancy, can reduce the risk of mission failure.
The specific operation process that should be appreciated that modules in the system embodiment of the present invention and unit can be identical with the description in the embodiment of the method, is not described in detail herein.
Although the above has illustrated and has described embodiments of the invention, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art can change above-described embodiment in the situation that does not break away from principle of the present invention and aim within the scope of the invention, modification, replacement and modification.
Claims (14)
1. the wireless communications method based on moonlet is characterized in that, may further comprise the steps:
S1: the control character of the first passing of satelline radio frames and data symbol send control channel and data channel, and wherein, Bearer Control channel in the described control character carries data channel in the described data symbol;
S2: the second satellite calculates frame regularly according to the synchronizing symbol that receives, and wherein, described radio frames provides described synchronizing symbol;
S3: regularly obtain the position of reference symbol and control character according to described frame, and receive the control information in the described control channel; And
S4: according to described frame regularly and described control information receive data message in the described data channel.
2. the wireless communications method based on moonlet as claimed in claim 1 is characterized in that, described step S1 specifically comprises:
S11: the control character of the first passing of satelline radio frames sends control channel; And
S12: the data symbol of the first passing of satelline radio frames sends data channel.
3. the wireless communications method based on moonlet as claimed in claim 2 is characterized in that, described step S11 further comprises:
S111: described control information is added cyclic redundancy check (CRC) and carried out channel convolutional coding acquisition the first control data;
S112: described the first control data are carried out rate-matched obtain the second control data;
S113: described the second control data are carried out albefaction process and modulate the acquisition modulation symbol; And
S114: described modulation symbol is mapped on the subcarrier of described control character, and the frequency domain data of described mapping is carried out sending to described the second satellite behind the Fast Fourier Transform Inverse.
4. the wireless communications method based on moonlet as claimed in claim 2 is characterized in that, described step S12 further comprises:
S121: described data message is added cyclic redundancy check (CRC) obtain the first data;
S122: described the first data sectional is become a plurality of encoding blocks;
S123: each encoding block to described a plurality of encoding blocks adds cyclic redundancy check (CRC) and carries out Turbo coding acquisition the second data;
S124: described the second data are spliced into a string data, and it is carried out rate-matched obtain the 3rd data;
S125: described the 3rd data are carried out albefaction process and modulate the acquisition modulation symbol; And
S126: described modulation symbol is mapped on the subcarrier of described data symbol, and the frequency domain data of described mapping is carried out sending to described the second satellite behind the Fast Fourier Transform Inverse.
5. the wireless communications method based on moonlet as claimed in claim 1 is characterized in that, described step S2 specifically comprises:
S21: the antenna data that receives is carried out down-conversion, analog-to-digital conversion, obtain digital baseband signal; And
S22: it is relevant to slide with the local synchronizing sequence of storing and described digital baseband signal, and calculates described frame regularly.
6. the wireless communications method based on moonlet as claimed in claim 1 is characterized in that, described step S3 specifically comprises:
S31: receive data is done the fast Fourier transform conversion on the border of received reference symbol and control character, obtains frequency domain data;
S32: in the frequency domain data of described reference symbol and control character, extract respectively reference symbol subcarrier and control channel subcarrier;
S33: carry out channel estimating with described reference symbol subcarrier and obtain channel evaluation data;
S34: carry out channel equalization reconciliation constellation mapping acquisition soft bit information according to described channel evaluation data and described control channel subcarrier;
S35: described soft bit information is carried out data length data before scramble process and rate de-matching obtain rate-matched; And
S36: the data length data before the described rate-matched are carried out Viterbi decoding and cyclic redundancy check (CRC), if cyclic redundancy check (CRC) by receive the control channel success.
7. the wireless communications method based on moonlet as claimed in claim 1 is characterized in that, described step S4 specifically comprises:
S41: receive data is done the fast Fourier transform conversion on the border of received reference symbol and data symbol, obtains frequency domain data;
S42: in the frequency domain data of described reference symbol and data symbol, extract respectively reference symbol subcarrier and data channel subcarrier;
S43: described reference symbol subcarrier is carried out channel estimating obtain channel evaluation data;
S44: carry out channel equalization reconciliation constellation mapping acquisition soft bit information according to described channel evaluation data and described data channel subcarrier;
S45: described soft bit information is carried out data length data before scramble process and rate de-matching obtain data rate;
S46: described data length data are cut apart obtain a plurality of encoding blocks;
S47: each encoding block to described a plurality of encoding blocks carries out Turbo decoding and cyclic redundancy check (CRC); And
S48: then will describedly remove cyclic redundancy check data when cyclic redundancy check (CRC) success and be spliced into a string data and carry out again cyclic redundancy check (CRC), if verification by described the second satellite reception data successfully.
8. the wireless communication system based on moonlet is characterized in that, comprising:
Sending module, the control character and the data symbol that are used for the first passing of satelline radio frames send control channel and data channel, and wherein, Bearer Control channel in the described control character carries data channel in the described data symbol;
The synchronizing signal receiver module is used for the second satellite and calculates frame regularly according to the synchronizing symbol that receives, and wherein, described radio frames provides described synchronizing symbol;
The control signal receiver module is used for regularly obtaining the position of reference symbol and control character according to described frame, and receives the control information in the described control channel; And
The data-signal receiver module, be used for according to described frame regularly and described control information receive the data message of described data channel.
9. the wireless communication system based on moonlet as claimed in claim 8 is characterized in that, described sending module specifically comprises:
Control channel sends submodule, and the control character that is used for the first passing of satelline radio frames sends control channel; And
Data channel sends submodule, and the data symbol that is used for the first passing of satelline radio frames sends data channel.
10. the wireless communication system based on moonlet as claimed in claim 9 is characterized in that, described control channel sends submodule and further comprises:
The first check code unit is used for described control information is added cyclic redundancy check (CRC) and carried out channel convolutional coding acquisition the first control data;
The rate-matched unit is used for that described the first control data are carried out rate-matched and obtains the second control data;
The first albefaction modulating unit is used for that described the second control data are carried out albefaction and processes and modulate the acquisition modulation symbol; And
The first mapping transformation unit is used for described modulation symbol is mapped to the subcarrier of described control character, and the frequency domain data of described mapping is carried out sending to described the second satellite behind the Fast Fourier Transform Inverse.
11. the wireless communication system based on moonlet as claimed in claim 9 is characterized in that, described data channel sends submodule and further comprises:
The second check code unit is used for that described data message is added cyclic redundancy check (CRC) and obtains the first data;
Segmenting unit is used for described the first data sectional is become a plurality of encoding blocks;
The 3rd check code unit is used for each encoding block of described a plurality of encoding blocks is added cyclic redundancy check (CRC) and carries out Turbo coding acquisition the second data;
The splicing matching unit is used for described the second data are spliced into a string data, and it is carried out rate-matched obtains the 3rd data;
The second albefaction modulating unit is used for that described the 3rd data are carried out albefaction and processes and modulate the acquisition modulation symbol; And
The second mapping transformation unit is used for described modulation symbol is mapped to the subcarrier of described data symbol, and the frequency domain data of described mapping is carried out sending to described the second satellite behind the Fast Fourier Transform Inverse.
12. the wireless communication system based on moonlet as claimed in claim 8 is characterized in that, described synchronizing signal receiver module specifically comprises:
The frequency conversion converting unit is used for the antenna data that receives is carried out down-conversion, analog-to-digital conversion, obtains digital baseband signal; And,
Computing unit, it is relevant to be used for sliding with the local synchronizing sequence of storing and described digital baseband signal, and calculates described frame regularly.
13. the wireless communication system based on moonlet as claimed in claim 8 is characterized in that, described control signal receiver module specifically comprises:
The first converter unit is used for doing the fast Fourier transform conversion at the border of received reference symbol and control character receive data, obtains frequency domain data;
The first extraction unit is used for extracting respectively reference symbol subcarrier and control channel subcarrier at the frequency domain data of described reference symbol and control character;
The first channel estimating unit is used for that described reference symbol subcarrier is carried out channel estimating and obtains channel evaluation data;
The first Well-Balanced Mapping unit is used for carrying out channel equalization reconciliation constellation mapping acquisition soft bit information according to described channel evaluation data and described control channel subcarrier;
The first rate de-matching unit is for the data length data of described soft bit information being carried out before scramble process and rate de-matching obtain rate-matched; And
The coupling verification unit is used for the data length data before the described rate-matched are carried out Viterbi decoding and cyclic redundancy check (CRC), if cyclic redundancy check (CRC) by receive the control channel success.
14. the wireless communication system based on moonlet as claimed in claim 8 is characterized in that, described data-signal receiver module specifically comprises:
The second converter unit is used for doing the fast Fourier transform conversion at the border of received reference symbol and data symbol receive data, obtains frequency domain data;
The second extraction unit is used for extracting respectively reference symbol subcarrier and data channel subcarrier at the frequency domain data of described reference symbol and data symbol;
The second channel estimation unit is used for that described reference symbol subcarrier is carried out channel estimating and obtains channel evaluation data;
The second Well-Balanced Mapping unit is used for carrying out channel equalization reconciliation constellation mapping acquisition soft bit information according to described channel evaluation data and described data channel subcarrier;
The second rate de-matching unit is for the data length data of described soft bit information being carried out before scramble process and rate de-matching obtain data rate;
Cutting unit obtains a plurality of encoding blocks for described data length data are cut apart;
The decoding verification unit is used for each encoding block of described a plurality of encoding blocks is carried out Turbo decoding and cyclic redundancy check (CRC); And
The splicing verification unit is used for then will describedly removing cyclic redundancy check data when the cyclic redundancy check (CRC) success and is spliced into a string data and carries out cyclic redundancy check (CRC) again, if verification by described the second satellite reception data are successful.
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| US20060285481A1 (en) * | 2005-06-13 | 2006-12-21 | Lane Frank A | Communications system, methods and apparatus |
| CN1960227A (en) * | 2006-08-09 | 2007-05-09 | 北京泰美世纪科技有限公司 | Method for sending control information to indicate operation of receiver |
| CN101252384A (en) * | 2008-03-28 | 2008-08-27 | 清华大学 | Star loading exchanging method based on OFDM and cross layer design |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060285481A1 (en) * | 2005-06-13 | 2006-12-21 | Lane Frank A | Communications system, methods and apparatus |
| CN1960227A (en) * | 2006-08-09 | 2007-05-09 | 北京泰美世纪科技有限公司 | Method for sending control information to indicate operation of receiver |
| CN101252384A (en) * | 2008-03-28 | 2008-08-27 | 清华大学 | Star loading exchanging method based on OFDM and cross layer design |
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